PDF malware analysis — malicious · b16d3dc4dac7ffaa

MALICIOUS

PDF

MD5: 13208a69d236eb528c725f7c7e85ba37 SHA-1: 05fd3b8fbed10c521674b74d3f4b56a65efeda5f SHA-256: b16d3dc4dac7ffaa5ed542c2968f4c92b82ec747b4cc9f5c5faee60cebbbe53e

176 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains embedded JavaScript and an embedded file, both flagged as malicious by ClamAV. The ML classifier also strongly indicates maliciousness. The embedded JavaScript is likely responsible for executing the embedded malicious document, which is detected as 'Doc.Downloader.Donoff-10030369-0'. This suggests a downloader or dropper functionality.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 6

ClamAV: Doc.Downloader.Donoff-10030369-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Donoff-10030369-0
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE

PDF has 1 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`QODFWA7R1.docm` `fce990b78a7b634760819cb452c524c5370c6b9de887f157e2721920b565cc2e`	pdf-embedded-file	PDF EmbeddedFile object 4 at offset 0x94F	55506 bytes
Detection ClamAV: Doc.Downloader.Donoff-10030369-0 Obfuscation or payload: unlikely
`javascript_obj0006_001.js` `0a956dfd8f982da0f449740e0ff36dbd4f6209052486e3c81fac8b761d69220d`	pdf-javascript-stream	PDF /JS object 6 at offset 0xC45D	6436 bytes

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